Method of setting up a connection for calls

ABSTRACT

The invention relates to a telecommunications system comprising at least a terminal ( 11 ) from which a connection can be set up to the Internet ( 12 ); and an exchange ( 14 ) for routing calls on the basis of information in a register ( 16 ). The system further comprises an Internet server ( 13 ) comprising means for controlling the instalment of the software required in the terminal ( 11 ) for making and receiving VoIP calls and the activation of the application required for making and receiving VoIP calls as a response to the request transmitted from the terminal ( 11 ); means for changing call forwarding information in the register ( 16 ); means for converting the data flow transmitted from the exchange ( 14 ) to the terminal ( 11 ) into a mode suitable for the terminal ( 11 ).

BACKGROUND OF THE INVENTION

[0001] The invention relates to call processing and particularly to making and answering calls by means of an IP (Internet Protocol) apparatus.

[0002] The VoIP (Voice of IP) technology refers to the transmission of voice communication in the form of data packets over an IP network. Previously known is a VoIP solution in which the user has separate VoIP terminal software in his personal computer, by means of which he can make and receive calls. In such a case, the software must be installed in the user's computer. Further, the user must configure certain network settings in his terminal, such as the gateways to be used, sub-networks and gatekeepers, before the software can be used. The VoIP program must be started every time the user wishes to make or receive calls.

[0003] A problem with the above-described solution is its complexity and the required installation and configuration measures. Furthermore, it is not user-friendly that separate software must be started every time when calls are processed.

BRIEF DESCRIPTION OF THE INVENTION

[0004] An object of the invention is thus to provide a method and an apparatus implementing the method in such a way that said problems can be solved. The object of the invention is achieved with a method and arrangement characterized in what is stated in the independent claims.

[0005] The object of the invention is to connect the VoIP technology to the present telephone system in a subscriber-specific manner. The invention is based on the idea that the user can make and receive calls with his own computer functioning as the VoIP terminal without any installing or configuration beforehand. An example of the utilization of the invention is a user who is travelling abroad and wishes to establish telephone communication. Thus, the user logs into the www (World Wide Web) server of the service provider by using any computer and receives automatically all calls addressed to him in his computer. Another example could be that the user is outside the area of the mobile network and wishes to listen to the messages left in the voice mail of the mobile station. In such a case, too, he can log into the www server in any computer having loudspeakers and a sound card and listen to the messages left in the voice mail. The solution is thus based on the idea that the user sets up a connection to the service provider's server and starts a telephone application. The required software is then automatically loaded to the user's terminal.

[0006] An advantage of the method and the system according to the invention is that it is user-friendly, because there is no need for carrying out software settings or device configuration measures, and no separate software needs to be started when calls are to be made or received.

[0007] In a first preferred embodiment of the telecommunications system according to the invention, the Internet server comprises means for converting a VoIP data flow into a streaming mode, and vice versa. The solution is based on combining the VoIP technology and the streaming technology in such a way that the user only sees the streaming part. Streaming refers to a technique of immediate video and audio information, in which sounds or images are transmitted over the Internet in almost real time. In other words, the file is not downloaded at first and replayed only after that, but the replaying begins as early as during the transmission. No video is used in this invention, but the technique has been designed for both data types. The VoIP signalling may be signalling according to the H.323-SIP (Session Initiating Protocol) or the MGCP (Media Gateway Control Protocol). The conversion from the VoIP mode into the streaming mode provides the advantage that the streaming technology typically requires less bandwidth for transferring sound than the VoIP technology. For the user this means higher quality of service.

[0008] In a second preferred embodiment of the telecommunications system according to the invention, the Internet server comprises means for controlling the installation of the software required for making and receiving VoIP calls and the activation of the application required for making and receiving VoIP calls as a response to a selection performed via a www page. Thus, the user sets up a connection in his terminal to the www page of the service provider and opens a streaming connection, whereby the service is activated. Thus, the server controls the loading of the required software to the terminal in such a way that the terminal can function as the client's telephone user interface.

[0009] Preferred embodiments of the invention are disclosed in the dependent claims.

BRIEF DESCRIPTION OF THE FIGURES

[0010] The invention will now be described in greater detail in connection with preferred embodiments, with reference to the attached drawings, of which

[0011]FIG. 1 shows a block diagram of a system according to the invention;

[0012]FIG. 2 shows a signalling diagram of a case of the method according to the invention, where the call is initiated and terminated by the VoIP user; and

[0013]FIG. 3 shows a signalling diagram of a case of the method according to the invention, where the call is initiated and terminated by the user of a public switched telephone network.

DETAILED DESCRIPTION OF THE INVENTION

[0014]FIG. 1 shows a block diagram of a system according to the invention. The figure shows only the essential elements from the point of view of the understanding of the invention. The system comprises a VoIP terminal 11 in data transmission connection with the Internet 12, which can be for instance a PC computer; a server 13 controlled by the service provider, which performs conversions between different protocols; and a gateway 14 connected to a public switched telephone network 15; and a home location register HLR in data transmission connection with the gateway. The gateway can also be connected to a GSM (Global System for Mobile Communication) mobile network. The server 13 consists of a VoIP part comprising the gatekeeper functions and operating in a way similar to a telephone exchange, and a streaming part comprising a streaming encoder and decoder.

[0015] Let us assume in a first example that the user wishes to activate the call service in his terminal 11. Thus, the user first sets up a connection via the Internet 12 to the service provider's www page and activates a call service from there by pressing a key. The server 13 opens then a streaming connection to the VoIP terminal 11 for calls. This can take place in such a way, for example, that a Java program is automatically loaded via a browser program, which Java program functions as the telephone user interface. In addition, information is transmitted from the server to the register 16 on the routing information to be changed.

[0016] In a second example, the user wishes to answer the call incoming from the public switched telephone network 15, for example. Thus, the incoming call is directed from the gateway 14 to the server 13 on the basis of the information in the register 16. Signalling takes place in a VoIP-based manner, for instance in accordance with the H.323 protocol. The software in the server 13 converts the speech or data incoming from the gateway into the streaming mode and transmits it further to the VoIP terminal 11. The streaming connection is maintained all the time between the VoIP terminal 11 and the server 13 at a low transmission rate, for example.

[0017] In a third example, the user wishes to make a call. Hence, the user starts the call in his VoIP terminal 11 by making a call by means of a program in the browser program. There is a streaming connection between the server 13 and the terminal 11. The server 13 converts the information in the streaming mode into the protocol-based VoIP mode and directs the call to the gateway 14. From there, the call is further directed to the telephone network 15.

[0018] In a fourth example, the user wishes to close the service. This is carried out in such a way that the client disconnects the streaming connection for example by closing the application in his browser or by exiting a certain www page.

[0019]FIG. 2 shows a signalling diagram of the method according to the invention, in which the call is initiated and terminated by the user of the VoIP terminal. The chain of events begins when the user opens a streaming connection from the terminal to the server. This command can be transmitted by means of the RTP (Real-time Transport Protocol) and the RTCP (RTP Control Protocol). Next, the user gives a call command from the terminal to the server, using the RTCP protocol. This command includes information related to the call in question, e.g. the number of the calling subscriber and the number of the called subscriber. After this, the server transmits a ‘set-up’ command to the gateway, to which command the gateway responds with a ‘call proceeding’ message. Next, the connection is set up with ‘alerting’ and ‘connect’ commands transmitted from the gateway to the server. When the user of the VoIP terminal wishes to terminate the call, a termination command according to the RTCP protocol is transmitted from the terminal to the server. Thus, the server further transmits a ‘release’ command to the gateway, and the gateway responds to the command with a ‘release completed’ command.

[0020]FIG. 3 shows a signalling diagram of a situation of the method according to the invention, where the call is initiated and terminated by the user of the telephone network. The chain of events begins when the user opens a streaming connection from the terminal to the server. This command can be transmitted by means of the RTP and RTCP protocols. Next, a ‘set-up’ command arrives from the gateway to the terminal, after which the server transmits a call command to the user, using an RTCP protocol. Next, the server transmits a ‘call proceeding’ message to the gateway, after which a connection is set up by means of ‘alerting’ and ‘connect’ commands transmitted from the server to the gateway. When the user in the public switched telephone network wishes to terminate the call, a ‘release’ command is transmitted from the gateway to the server. The server thus further transmits a termination command according to the RTCP protocol to the VoIP terminal. Finally, the gateway transmits a ‘release completed’ command to the gateway. Deviating from the example, the calling party may also be a user of the DGSM network, for instance.

[0021] The messages according to the VoIP protocol shown in FIGS. 2 and 3 are according to the standard H.323/H.225.0, but the invention can also utilize the SIP protocol, the MGCP protocol or corresponding protocols based on signalling.

[0022] It will be obvious to a person skilled in the art that with the advance of technology, the basic idea of the invention can be implemented in a plurality of ways. Thus, the invention and embodiments thereof are not confined to the above-described examples but can vary within the scope of the claims. 

1. A telecommunications system comprising at least a terminal (11) from which a connection can be set up to the Internet (12); a register (16) in which subscriber-specific information on call forwarding is stored; and an exchange (14) for routing calls on the basis of the information in said register (16), characterized in that the system further comprises an internet server (13) comprising means for controlling the installation of software required in the terminal (11) for making and receiving VoIP calls and the activation of an application required for making and receiving VoIP calls as a response to a request transmitted from the terminal (11); means for changing call forwarding information in the register (16) as a response to said activation of the application required for making and receiving VoIP calls; and means for converting a data flow transmitted from the exchange (14) to the terminal (11) into a mode suitable for the terminal (11) and its software during the call.
 2. A telecommunications system according to claim 1, characterized in that the Internet server (13) comprises means for converting the VoIP data flow into a streaming mode, and vice versa.
 3. A telecommunications system according to claim 1 or 2, characterized in that said means for controlling the installation of the software and the activation of the application comprise means for controlling the installation of the software and the activation of the application as a response to selection of the task performed via a www page.
 4. An Internet server in a telecommunications system, characterized in that the Internet server (13) comprises means for controlling the installation of software required in a terminal (11) for making and receiving VoIP calls and the activation of an application required for making and receiving VoIP calls as a response to a request transmitted from the terminal (11); means for changing call forwarding information in a register (16) as a response to said activation of the application required for making and receiving VoIP calls; means for converting a data flow transmitted from the exchange (14) to the terminal (11) into a mode suitable for the terminal (11) and its software during the call.
 5. An Internet server (13) according to claim 4, characterized in that the Internet server (13) comprises means for converting the VoIP data flow into a streaming mode, and vice versa.
 6. A method of setting up a connection for VoIP calls, characterized by bringing into use an Internet server (13) comprising means for controlling the installation of software required in a terminal (11) for making and receiving VoIP calls and the activation of the application required for making and receiving VoIP calls as a response to a request transmitted from the terminal (11); setting up a connection between the terminal (11) and the server (13); activating in the terminal (11) the application required for making and receiving VoIP calls, whereby the required software is loaded to the terminal (11); and changing subscriber-specific call forwarding information in a register (16) in order for the calls incoming to the subscribers to be routed to the terminal (11).
 7. A method according to claim 6 for setting up a connection for VoIP calls, characterized by the method comprising a step in which the software required for making and receiving VoIP calls is installed and the application required for making and receiving calls is activated as a response to a selection performed by the user via a www page.
 8. A method according to claim 6 or 7 for setting up a connection for VoIP calls, characterized by the method comprising the following steps for receiving calls: directing an incoming call in the form of a VoIP data flow from the exchange (14) to said server (13); converting in the server (13) the data flow received from the exchange (14) into the streaming mode; transmitting the call to the terminal (11) in a streaming mode.
 9. A method according to any one of claims 6 to 8 for setting up a connection for VoIP calls, characterized by the method comprising the following steps for making calls: making a call by means of a browser program in the terminal (11); converting in the server (13) a streaming data flow received from the terminal (11) into the VoIP mode; transmitting the call in the VoIP mode to the exchange (14), from which the call is further transmitted to the telephone network (15). 